Adjustable book stand



FIG. 1 is a perspective view of an adjustable book stand, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left hand view thereof;

FIG. 5 is a right hand view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for an adjustable book stand, as shown and described. 